I don't know if I understand what you're trying to achieve, but if you just want to create an arbitrary number based on the image contents, you can apply a checksum to the the image contents. Try an MD5 [1] or SHA1 hash, or even a CRC.
[1] http://www.scheme.dk/md5
--
Gordon Weakliem
http://www.eighty-twenty.net
-----Original Message from Charbonneau Nathalie <nathalie.charbonneau at umontreal.ca>-----
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Hi!
I would like to have an information.
I want to assign a numeric value to an image (GIF format).
When the scheme program would evaluate the image, it would give back the numeric value.
How can I do it?
Thank you in advance.
Nathalie Charbonneau
Montreal University (Canada)